Reason for manual update of hash: https://github.com/python-poetry/poetry/issues/4523

- bump p-astro to a pre-release v1.0.0dev1, stripping all em-bright components
- add ligo.em-bright dependency

Leo Pound Singer authored 3 years ago and Leo Pound Singer committed 3 years ago

Create threads in the start() method rather than the create()
method, so that if the bootstep is stopped and restarted, a fresh
thread is created.

Fixes #397.

This reverts commit 1ad6900c.